When two boats share the same hull type — in this case both the Weld-Craft CDS 42 (15 ft.) 2010 and the Weld-Craft Jon Boats 2011 are flat designs with aluminum construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
Both boats share a closely matched power ceiling — 25 hp for the Weld-Craft CDS 42 (15 ft.) 2010 and 15 hp for the Weld-Craft Jon Boats 2011. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
The Weld-Craft CDS 42 (15 ft.) 2010 is rated for up to 4 people. Passenger data for the Weld-Craft Jon Boats 2011 wasn't available.
Bottom line: The Weld-Craft CDS 42 (15 ft.) 2010 at 15,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Weld-Craft Jon Boats 2011 at 12,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.